Accident Sequence
A pilot reported that while cruising at 16,000 feet mean sea level, a loud explosion was heard from the engine compartment, followed by a loss of engine power. The pilot descended through instrument meteorological conditions. Upon breaking out of the clouds, the airport was not in sight, and a forced landing was executed in a field.
Examination Findings
A Federal Aviation Administration inspector examined the wreckage and noted that the airplane was in a wet wheat field. Approximately 1,000 feet of ground scars led through a ditch to the wreckage. The inspector reported no evidence of preimpact airframe malfunction.
Engine Disassembly Findings
Disassembly of the engine revealed that the number one connecting rod had failed due to fatigue. The fatigue originated from a decarburized layer on the shank of the rod.